Title :
On current control method for single-phase AC resistance spot welding
Author :
Kang Zhou ; Lilong Cai
Author_Institution :
Dept. of Mech. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
The paper deals with the constant current control for single-phase AC resistance spot welding (RSW), which is the most commonly used control strategy in modern welding industry. The process of RSW is nonlinear and time-varying. After analyzing the working principle and nonlinear properties of RSW, a mathematical relation between input and output variables for constant current control is developed. A PI controller, which is used to regulate the desired current used in the mathematical relation, is employed to improve the performance. The final experimental results showed the performance obtained by new controller was better than that by a fine-tuned PID controller.
Keywords :
PI control; control system synthesis; electric current control; mathematical analysis; nonlinear control systems; spot welding; three-term control; time-varying systems; PI controller; RSW nonlinear properties; control strategy; current control method; fine-tuned PID controller; mathematical relation; nonlinear process; single-phase AC resistance spot welding; time-varying process; welding industry; working principle; Coils; Current control; Equations; Firing; Resistance; Spot welding;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4673-1261-5
Electronic_ISBN :
978-1-4673-1259-2
DOI :
10.1109/ICECS.2012.6463617
